Vaisala HMP9 Datasheet
HMP9 Compact Humidity and
0
10
20
30
40
50
60
Time [s]
70
Temperature [°C]
0 60 120 180 240 300
HMP7
HMP9
T90
T63
Temperature Probe
Features
• Miniature probe head with low
thermal mass for superior
response time
• RH accuracy up to 0.8 %RH
• Temperature accuracy up to 0.1 °C
(0.18 °F)
• Temperature measurement range
−40 … +120 °C (−40 … +248 °F)
• Sensor purge provides superior
chemical resistance
• Modbusâ RTU over RS-485
• Compatible with Indigo
transmitters and Insight PC
software
• Traceable calibration certificate:
6 points for humidity, 1 point for
temperature
• M10×1.5 cable gland included for
mounting the probe head
â
Vaisala HUMICAP
Humidity and Temperature Probe HMP9 is designed for easy
installation into rapidly changing environments where fast response time,
measurement performance, and chemical tolerance are essential.
Miniatyre probe head with
HUMICAPâ performance
The main feature of HMP9 is its 5 mm
(0.2 in) diameter miniature probe head.
Despite the small footprint, the probe
head contains a HUMICAPâ sensor that
provides its industry standard humidity
measurement performance.
HMP9 has great stability, fast response
time, and low hysteresis in a wide range
of applications. This makes it the
superior choice in applications where the
mechanical properties or replaceable
filters of the heavier probes are not
needed.
Measurement environments where
occasional condensation is present are
not a problem as long as the probe is
protected from exposure to liquid water.
For continuously condensing
environments, use HMP7 with probe
heating instead.
HMP9 T response time compared to
HMP7
Chemical purge minimizes
eects of contaminants
In environments with high
concentrations of chemicals and cleaning
agents, the chemical purge option helps
to maintain measurement accuracy
between calibration intervals.
The chemical purge involves heating the
sensor to remove harmful chemicals. The
function can be initiated manually or
programmed to occur at set intervals.
Flexible connectivity
The probe is compatible with Vaisala
Indigo series transmitters, and it can be
used as a standalone digital Modbus RTU
transmitter over RS-485 serial bus. For
easy-to-use access to field calibration,
device analytics, and configuration
functionality, the probe can be
connected to Vaisala Insight software for
Windowsâ. For more information, see
www.vaisala.com/insight.
Technical data
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
Accuracy [+/- % RH]
Temperature [°C]
3.5
4.0
90 ... 100 %RH
0 ... 90 %RH
0
0.1
0.2
0.3
0.4
Accuracy [+/-
°C]
Temperature [°C]
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
0.5
Measurement performance
Relative humidity
Measurement range 0 … 100 %RH
Accuracy at +23 °C (+73.4 °F)
1)
Factory calibration uncertainty
T63 response time
3)
Sensor
Temperature
Measurement range −40 … +120 °C (−40 … +248 °F)
Accuracy at +23 °C (+73.4 °F)
1)
Factory calibration uncertainty
T63 response time
1) Defined against calibration reference. Including non-linearity, hysteresis, and repeatability.
2) Defined as ±2 standard deviation limits. Small variations possible; see calibration certificate.
3) In still air.
3)
HMP9 humidity measurement accuracy as a function of
temperature
±0.8 %RH (0 … 90 %RH)
2)
±0.7 %RH (0 … 40 %RH)
±1 %RH (40 … 95 %RH)
15 s
HUMICAPâ I
±0.1 °C (±0.18 °F)
2)
±0.1 °C (±0.18 °F) at +23 °C (+73.4 °F)
70 s
Inputs and outputs
Operating voltage 15 … 30 V DC
Current consumption 5 mA typical, 400 mA max.
Digital output RS-485, non-isolated
Default serial settings 19200 bps N 8 2
Protocol Modbus RTU
Output parameters
Absolute humidity (g/m3)
Absolute humidity at NTP (g/m3)
Dew point temperature (°C) Temperature (°C)
Dew/frost point temperature (°C) Water concentration (ppmv)
Dew/frost point temperature at 1 atm
(°C)
Dew point temperature at 1 atm (°C) Water mass fraction (ppmw)
Dew point temperature dierence (°C) Water vapor pressure (hPa)
Enthalpy (kJ/kg) Water vapor saturation pressure
Mixing ratio (g/kg) Wet-bulb temperature (°C)
Relative humidity (%RH)
Relative humidity (dew/frost) (%RH)
Water concentration (wet basis)
(vol‑%)
(hPa)
Compliance
EU directives EMC Directive (2014/30/EU)
EMC compatibility EN 61326‑1, industrial environment
Compliance marks CE, China RoHS, RCM, WEEE
RoHS Directive (2011/65/EU)
Mechanical specifications
Connector M12 5-pin A-coded male
Weight 68 g (2.40 oz)
Materials
Probe AISI 316L
Probe body PBT
Cable overmolds FEP
HMP9 temperature measurement accuracy over full
range
Operating environment
Operating temperature of probe body −40 … +60 °C (−40 … +140 °F)
Operating temperature of probe head −40 … +120 °C (−40 … +248 °F)
Storage temperature −40 … +60 °C (−40 … +140 °F)
Operating environment Suitable for outdoor use when
Measurement environment For air, nitrogen, hydrogen, argon,
IP rating of probe body IP65
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases.
protected from rain
helium, and oxygen
Accessories
HMP9 calibration adapter for HMK15 ASM213801
HMP9 duct installation kit ASM214055
Solar radiation shield DTR502B with
sensor head support 215130
Indigo USB adapter
1) Vaisala Insight software for Windows available at www.vaisala.com/insight.
1)
1)
DTR502B and 215130
USB2
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